Malicious PDF — malware analysis report

Static analysis result for SHA-256 307b03b30e1c98b1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 04:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0edb42dbedd614523cca26779885b4c3 SHA-1: 0685f693f2d8368615aa3451860163bf99a2232d SHA-256: 307b03b30e1c98b1a8ceb4ff3a2b10c724555d40ef5c1b50dca518f86562ac0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple domains, several of which are identified as compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://psychologkmalinowska.pl/ckfinder/userfiles/files/bipefen.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43b8a774---79421619049.pdfIn PDF document text
    • http://ijfbn.com/editor_up/18351576417.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/33558499740.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c9e6d846---58675130885.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/magoxizezojafad.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/posanesituwiwaweworurifo.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/9525211715.pdfIn PDF document text
    • http://dejede.com/userfiles/file/gutitokowidisufasusubabu.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/76657624885.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64745236158.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109062245449739.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385bf864e9b---rafidojuruvanupuwunepap.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3c84208a003a814685580a8b734cf206/2446955011.pdfIn PDF document text
    • http://ledins.lv/cms/file/ninosasikadumebex.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lewapilepeda.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/gopebukavuxosegedo.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/38920888115.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed86221f73---988209017.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/3180293580.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/98959120851.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/55336051954.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fesol.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lexorunizisiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+x8+sandboxPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 10356 bytes
SHA-256: 0901db4b94b58df13ed7aaaa479f38f8604f7b5ec93445fb7792eb9b9cbe9fc0
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 17304 bytes
SHA-256: 40dcf5fcecf0efe05f205cc4726165e4c98774ef966fd8f4f56538598078cb15
font_02_sfnt_off000123a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1